SOLUTION: You threw a ball straight DOWN at an initial velocity of 32 ft/sec from a platform 384 ft tall. How long will it take to hit the ground?

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Question 101841: You threw a ball straight DOWN at an initial velocity of 32 ft/sec from a platform 384 ft tall. How long will it take to hit the ground?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
You threw a ball straight DOWN at an initial velocity of 32 ft/sec from a platform 384 ft tall. How long will it take to hit the ground?
:
Using the equation (both gravity and initial velocity are downward):
-16t^2 - 32t + 384 = 0
:
Simplify divide equation by -16
t^2 + 2t - 24 = 0
:
Factor:
(t + 6) (t - 4) = 0
:
t = + 4 seconds to hit the ground
:
:
Substitute 4 for t in the original equation to check solution
-16(4^2) - 32(4) + 384 = 0